Finding the Fourth Proportional to 2,088.56, 3,131.22 and 856.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,088.56 : 3,131.22 = 856.28 : x
2. Step 2: Convert to fraction form
   2,088.56/3,131.22 = 856.28/x
3. Step 3: Cross multiply
   2,088.56x = 3,131.22 × 856.28
4. Step 4: Simplify right side
   2,088.56x = 2,681,201.06
5. Step 5: Solve for x
   x = 2,681,201.06/2,088.56
6. Step 6: Final answer
   x = 1,283.76